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authorSergio Carlavilla Delgado <carlavilla@FreeBSD.org>2021-01-25 23:31:29 +0000
committerSergio Carlavilla Delgado <carlavilla@FreeBSD.org>2021-01-25 23:31:29 +0000
commit989d921f5d4ac8d8b7c831c13b8954ad1901be24 (patch)
treea5d768f9af4b55422fdf5b17064879ae1c7ce032 /share/security/advisories/FreeBSD-SA-03:17.procfs.asc
parent0cff342f42461c5081b98bce7581f43df319e4f4 (diff)
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Migrate doc to Hugo/AsciiDoctor
I'm very pleased to announce the release of our new website and documentation using the new toolchain with Hugo and AsciiDoctor. To get more information about the new toolchain please read the FreeBSD Documentation Project Primer[1], Hugo docs[2] and AsciiDoctor docs[3]. Acknowledgment: Benedict Reuschling <bcr@> Glen Barber <gjb@> Hiroki Sato <hrs@> Li-Wen Hsu <lwhsu@> Sean Chittenden <seanc@> The FreeBSD Foundation [1] https://docs.FreeBSD.org/en/books/fdp-primer/ [2] https://gohugo.io/documentation/ [3] https://docs.asciidoctor.org/home/ Approved by: doceng, core
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------BEGIN PGP SIGNED MESSAGE-----
-Hash: SHA1
-
-=============================================================================
-FreeBSD-SA-03:17.procfs Security Advisory
- The FreeBSD Project
-
-Topic: kernel memory disclosure via procfs
-
-Category: core
-Module: sys
-Announced: 2003-10-03
-Credits: Joost Pol <joost@pine.nl>
-Affects: All FreeBSD releases
-Corrected: 2003-10-03 12:03:50 UTC (RELENG_4, 4.9-RC)
- 2003-10-03 13:02:17 UTC (RELENG_5_1, 5.1-RELEASE-p9)
- 2003-10-03 16:57:38 UTC (RELENG_5_0, 5.0-RELEASE-p17)
- 2003-10-03 13:03:44 UTC (RELENG_4_8, 4.8-RELEASE-p12)
- 2003-10-03 13:04:19 UTC (RELENG_4_7, 4.7-RELEASE-p22)
- 2003-10-03 13:05:05 UTC (RELENG_4_6, 4.6-RELEASE-p25)
- 2003-10-03 13:05:44 UTC (RELENG_4_5, 4.5-RELEASE-p36)
- 2003-10-03 13:06:32 UTC (RELENG_4_4, 4.4-RELEASE-p46)
- 2003-10-03 13:07:37 UTC (RELENG_4_3, 4.3-RELEASE-p42)
-FreeBSD only: YES
-
-For general information regarding FreeBSD Security Advisories,
-including descriptions of the fields above, security branches, and the
-following sections, please visit
-<URL:http://www.freebsd.org/security/>.
-
-I. Background
-
-The process file system, procfs(5), implements a view of the system
-process table inside the file system. It is normally mounted on
-/proc, and is required for the complete operation of programs such as
-ps(1) and w(1).
-
-The Linux process file system, linprocfs(5), emulates a subset of
-Linux's process file system and is required for the complete operation
-of some Linux binaries.
-
-II. Problem Description
-
-The procfs and linprocfs implementations use uiomove(9) and the
-related `struct uio' in order to fulfill read and write requests.
-Several cases were identified where members of `struct uio' were not
-properly validated before being used. In particular, the `uio_offset'
-member may be negative or extremely large, and was used to compute the
-region of kernel memory to be returned to the user.
-
-III. Impact
-
-A malicious local user could arrange to use a negative or extremely
-large offset when reading from a procfs ``file'', causing a system
-crash, or causing the kernel to return a large portion of kernel
-memory. Such memory might contain sensitive information, such as
-portions of the file cache or terminal buffers. This information
-might be directly useful, or it might be leveraged to obtain elevated
-privileges in some way. For example, a terminal buffer might include
-a user-entered password.
-
-IV. Workaround
-
-Unmount the procfs and linprocfs filesystems if they are mounted.
-Execute the following command as root:
-
- umount -a -t procfs,linprocfs
-
-Also, remove or comment out any lines in fstab(5) that reference
-`procfs' or `linprocfs', so that they will not be re-mounted at next
-reboot.
-
-V. Solution
-
-1) Upgrade your vulnerable system to 4-STABLE, or to the
-RELENG_5_1, RELENG_4_8, or RELENG_4_7 security branch dated
-after the correction date.
-
-2) To patch your present system:
-
-a) Download the relevant patch from the location below, and verify the
-detached PGP signature using your PGP utility.
-
-[FreeBSD 4.3]
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs43.patch
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs43.patch.asc
-
-[FreeBSD 4.4 and later 4.x]
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs4x.patch
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs4x.patch.asc
-
-[FreeBSD 5.0]
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs50.patch
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs50.patch.asc
-
-[FreeBSD 5.1]
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs51.patch
-# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-03:17/procfs51.patch.asc
-
-b) Apply the patch.
-
-# cd /usr/src
-# patch < /path/to/patch
-
-c) Recompile your kernel as described in
-<URL:http://www.freebsd.org/handbook/kernelconfig.html>
-and reboot the system.
-
-VI. Correction details
-
-The following list contains the revision numbers of each file that was
-corrected in FreeBSD.
-
-Branch Revision
- Path
-- -------------------------------------------------------------------------
-RELENG_4
- src/sys/i386/linux/linprocfs/linprocfs_misc.c 1.3.2.9
- src/sys/kern/kern_subr.c 1.31.2.3
- src/sys/miscfs/procfs/procfs_dbregs.c 1.4.2.4
- src/sys/miscfs/procfs/procfs_fpregs.c 1.11.2.4
- src/sys/miscfs/procfs/procfs_regs.c 1.10.2.4
- src/sys/miscfs/procfs/procfs_rlimit.c 1.5.2.1
- src/sys/miscfs/procfs/procfs_status.c 1.20.2.5
- src/sys/sys/uio.h 1.11.2.2
-RELENG_5_1
- src/UPDATING 1.251.2.11
- src/sys/conf/newvers.sh 1.50.2.11
- src/sys/fs/procfs/procfs_dbregs.c 1.22.2.1
- src/sys/fs/procfs/procfs_fpregs.c 1.28.2.1
- src/sys/fs/procfs/procfs_regs.c 1.27.2.1
- src/sys/fs/pseudofs/pseudofs_vnops.c 1.35.2.1
- src/sys/kern/kern_subr.c 1.74.2.1
- src/sys/sys/uio.h 1.27.2.1
-RELENG_5_0
- src/UPDATING 1.229.2.23
- src/sys/conf/newvers.sh 1.48.2.18
- src/sys/fs/procfs/procfs_dbregs.c 1.21.2.1
- src/sys/fs/procfs/procfs_fpregs.c 1.27.2.1
- src/sys/fs/procfs/procfs_regs.c 1.26.2.1
- src/sys/fs/pseudofs/pseudofs_vnops.c 1.32.2.1
- src/sys/kern/kern_subr.c 1.63.2.2
- src/sys/sys/uio.h 1.23.2.1
-RELENG_4_8
- src/UPDATING 1.73.2.80.2.14
- src/sys/conf/newvers.sh 1.44.2.29.2.13
- src/sys/i386/linux/linprocfs/linprocfs_misc.c 1.3.2.8.10.1
- src/sys/kern/kern_subr.c 1.31.2.2.6.1
- src/sys/miscfs/procfs/procfs_dbregs.c 1.4.2.3.8.1
- src/sys/miscfs/procfs/procfs_fpregs.c 1.11.2.3.8.1
- src/sys/miscfs/procfs/procfs_regs.c 1.10.2.3.8.1
- src/sys/miscfs/procfs/procfs_rlimit.c 1.5.14.1
- src/sys/miscfs/procfs/procfs_status.c 1.20.2.4.8.1
- src/sys/sys/uio.h 1.11.2.1.8.1
-RELENG_4_7
- src/UPDATING 1.73.2.74.2.25
- src/sys/conf/newvers.sh 1.44.2.26.2.24
- src/sys/i386/linux/linprocfs/linprocfs_misc.c 1.3.2.8.8.1
- src/sys/kern/kern_subr.c 1.31.2.2.4.1
- src/sys/miscfs/procfs/procfs_dbregs.c 1.4.2.3.6.1
- src/sys/miscfs/procfs/procfs_fpregs.c 1.11.2.3.6.1
- src/sys/miscfs/procfs/procfs_regs.c 1.10.2.3.6.1
- src/sys/miscfs/procfs/procfs_rlimit.c 1.5.12.1
- src/sys/miscfs/procfs/procfs_status.c 1.20.2.4.6.1
- src/sys/sys/uio.h 1.11.2.1.6.1
-RELENG_4_6
- src/UPDATING 1.73.2.68.2.54
- src/sys/conf/newvers.sh 1.44.2.23.2.42
- src/sys/i386/linux/linprocfs/linprocfs_misc.c 1.3.2.8.6.1
- src/sys/kern/kern_subr.c 1.31.2.2.2.1
- src/sys/miscfs/procfs/procfs_dbregs.c 1.4.2.3.4.1
- src/sys/miscfs/procfs/procfs_fpregs.c 1.11.2.3.4.1
- src/sys/miscfs/procfs/procfs_regs.c 1.10.2.3.4.1
- src/sys/miscfs/procfs/procfs_rlimit.c 1.5.10.1
- src/sys/miscfs/procfs/procfs_status.c 1.20.2.4.4.1
- src/sys/sys/uio.h 1.11.2.1.4.1
-RELENG_4_5
- src/UPDATING 1.73.2.50.2.53
- src/sys/conf/newvers.sh 1.44.2.20.2.37
- src/sys/i386/linux/linprocfs/linprocfs_misc.c 1.3.2.8.4.1
- src/sys/kern/kern_subr.c 1.31.2.1.2.1
- src/sys/miscfs/procfs/procfs_dbregs.c 1.4.2.3.2.1
- src/sys/miscfs/procfs/procfs_fpregs.c 1.11.2.3.2.1
- src/sys/miscfs/procfs/procfs_regs.c 1.10.2.3.2.1
- src/sys/miscfs/procfs/procfs_rlimit.c 1.5.8.1
- src/sys/miscfs/procfs/procfs_status.c 1.20.2.4.2.1
- src/sys/sys/uio.h 1.11.2.1.2.1
-RELENG_4_4
- src/UPDATING 1.73.2.43.2.54
- src/sys/conf/newvers.sh 1.44.2.17.2.45
- src/sys/i386/linux/linprocfs/linprocfs_misc.c 1.3.2.8.2.1
- src/sys/kern/kern_subr.c 1.31.6.1
- src/sys/miscfs/procfs/procfs_dbregs.c 1.4.2.2.2.2
- src/sys/miscfs/procfs/procfs_fpregs.c 1.11.2.2.2.2
- src/sys/miscfs/procfs/procfs_regs.c 1.10.2.2.2.2
- src/sys/miscfs/procfs/procfs_rlimit.c 1.5.6.1
- src/sys/miscfs/procfs/procfs_status.c 1.20.2.3.4.2
- src/sys/sys/uio.h 1.11.6.1
-RELENG_4_3
- src/UPDATING 1.73.2.28.2.41
- src/sys/conf/newvers.sh 1.44.2.14.2.31
- src/sys/i386/linux/linprocfs/linprocfs_misc.c 1.3.2.5.2.1
- src/sys/kern/kern_subr.c 1.31.4.1
- src/sys/miscfs/procfs/procfs_dbregs.c 1.4.2.1.2.2
- src/sys/miscfs/procfs/procfs_fpregs.c 1.11.2.1.2.2
- src/sys/miscfs/procfs/procfs_regs.c 1.10.2.1.2.2
- src/sys/miscfs/procfs/procfs_rlimit.c 1.5.4.1
- src/sys/miscfs/procfs/procfs_status.c 1.20.2.3.2.2
- src/sys/sys/uio.h 1.11.4.1
-- -------------------------------------------------------------------------
-
-VII. References
-
-<URL:http://www.pine.nl/press/pine-cert-20030902.txt>
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generated by cgit v1.2.3 (git 2.25.1) at 2024-09-26 12:21:20 +0000